Surface-Wave Magnitude
“Surface-Wave Magnitude” is the magnitude of an earthquake that scientists estimate using measurements of the amplitude of surface waves.
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Time Stratigraphic Unit
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Regional Metamorphism
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Moment Magnitude (M)
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Terrestrial Planet Definition
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Geologic Time Scale
Geologic Time Scale The Geologic Time Scale is an international system used by geologists to classify and identify major geologic events and formations. The geologic timescale essentially categories the earth’s entire geologic (and biologic) history, within a series of defined eons, eras, periods, epochs, and ages. Updates & Maintenance The geologic time scale is continuously…
